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Long-Term Debt - Additional Information (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 26, 2021 | Sep. 30, 2019 | Sep. 30, 2017 | Sep. 30, 2016
Continuing Operations |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, balance |  | $ 5,549 |  |
Continuing Operations | Mortgage Note | Federal Home Loan Board Five Year Classic Advance Rate | Scenario, Forecast |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 240.00% |  |  |
Continuing Operations | BTU International, Inc. | Mortgage Note |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, balance |  | $ 5,500 |  |
Maturity date |  | Sep. 26, 2023 |  |
Interest rate |  |  |  | 4.11%
Discontinued Operations |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate swap rate term |  |  | 10 years |
Discontinued Operations | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, balance |  | $ 300 | $ 400 |
Interest rate |  | 2.23% |  |
Interest rate discount |  |  | 1.00% |
Debt instrument, term |  |  | 15 years |
Discontinued Operations | Swap Rate | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  |  | 2.40% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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